|Performance evaluation of the digital AM receiver (Volume Report (University of Illinois at Urbana-Champaign. Dept. of Computer Science) no. 757) - Mohan, Paul L., 1952-|
Keywords: Amplitude modulation; Digital electronics; Radio
|Implementation of Amplitude Modulation on Software Defined Radio - K Satyanarayana, Suneel Madhekar, Ravi Ranjan|
Implementing AM on software Defined radio which relies on Matlab and Simulink.
Keywords: Software Defined Radio; Amplitude Modulation
|Hypotheses on luminous ether and on an experiment that appears to demonstrate that the motion of bodies changes the velocity with which light propagates in their interior - Fizeau, H|
Fresnel hypothesis on changes in speed of light traveling through bodies due to motion of bodies
Keywords: ELECTRONIC EQUIPMENT; RADIO RECEIVERS; SIGNAL RECEPTION; AMPLITUDE MODULATION; FREQUENCY MODULATION; PRODUCT DEVELOPMENT; SYSTEMS ENGINEERING
|EFFECTS OF NEW APPROACH PROCEDURES ON COCKPIT DESIGN AND CHANCES FOR REALIZATION - HAEUSE|
DESIGN OF THE COCKPIT AS THE WORKING PLACE FOR THE CREW AND THE INTERFACE BETWEEN MAN AND MACHINE FOR AIRCRAFT GUIDANCE IS A TASK OF GREAT COMPLEXITY WHICH CAN BE STRUCTURED AND BETTER MASTERED THROUGH THE METHODOLOGY OF SYSTEMS DEVELOPMENT. AFTER DEFINING THE TASK OF COCKPIT DESIGN, NECESSITIES ARE SPECIFIED AND THE CHANCES OF USING THESE SPECIFIED VALUES IN PRACTICE IN ALL PHASES OF DEVELOPMENT ARE INDICATED...
Keywords: AMPLITUDE MODULATION; AUDITORY PERCEPTION; FREQUENCY MODULATION; PITCH; AUDIO FREQUENCIES; FREQUENCY RESPONSE; SOUND INTENSITY; THRESHOLDS (PERCEPTION)
|Combustion instability research Summary report, 1970 - Bracco, F. V.|
Combustion instability in liquid rocket engines
Keywords: AMPLIFICATION; PHASE LOCKED SYSTEMS; SIGNAL RECEPTION; AMPLITUDE MODULATION; FREQUENCY MODULATION; PHASE COHERENCE; PHASE MODULATION
|Selective radio frequency pulses by optimal control - Mao, Jintong|
Keywords: Pulse amplitude modulation; Control theory; Mathematical optimization; Conjugate gradient methods; Radio frequency
|Lunar samples - Greeley, R|
Mineralogy and petrology of lunar surface rocks are studied by familiarization with common rock textures and structure as related to their mode of formation. Comparison of terrestrial rocks with lunar samples through the use of thin sections and pseudo-sections is advocated.
Keywords: COMPUTER TECHNIQUES; EDUCATION; TELECOMMUNICATION; AMPLITUDE MODULATION; COMMUNICATION THEORY; EDUCATIONAL TELEVISION; FREQUENCY MODULATION
|The Nature and Evolutionary History of GRO J1744-28 - Rappaport, S|
GRO J1744-28 is the first known X-ray source to display bursts, periodic pulsations, and quasi-periodic oscillations. This source may thus provide crucial clues that will lead to an understanding of the differences in the nature of the X-ray variability from various accreting neutron stars. The orbital period is 11.8 days, and the measured mass function of 1.31 x 10(exp -4) solar mass is one of the smallest among all known binaries...
Keywords: ARCTIC OCEAN; TRENDS; ANTARCTIC REGIONS; ARCTIC REGIONS; OSCILLATIONS; PERIODIC VARIATIONS; TIME SERIES ANALYSIS; SEA ICE; AMPLITUDE MODULATION; DECOMPOSITION
|Ultraviolet Studies of Jupiter's Hydrocarbons and Aerosols from Galileo - Gladstone, G. Randal|
This is the final report for this project. The purpose of this project was to support PI Wayne Pryor's effort to reduce and analyze Galileo UVS (Ultraviolet Spectrometer) data under the JSDAP program. The spectral observations made by the Galileo UVS were to be analyzed to determine mixing ratios for important hydrocarbon species (and aerosols) in Jupiter's stratosphere as a function of location on Jupiter...
Keywords: QUASI-BIENNIAL OSCILLATION; STRATOSPHERE; SOLAR ACTIVITY; TWO DIMENSIONAL MODELS; MESOSPHERE; OSCILLATIONS; AMPLITUDE MODULATION; ZONAL FLOW (METEOROLOGY); GRAVITY WAVES
|Task III: Development of an Effective Computational Methodology for Body Force Representation of High-speed Rotor 37 - Tan, Choon-Soo|
A framework for an effective computational methodology for characterizing the stability and the impact of distortion in high-speed multi-stage compressor is being developed. The methodology consists of using a few isolated-blade row Navier-Stokes solutions for each blade row to construct a body force database. The purpose of the body force database is to replace each blade row in a multi-stage compressor by a body force distribution to produce same pressure rise and flow turning...
Keywords: MICROWAVE INTERFEROMETERS; TRANSMITTER RECEIVERS; AMPLITUDE MODULATION; ELECTRON DENSITY (CONCENTRATION); PLASMAS (PHYSICS); ERROR ANALYSIS; DATA REDUCTION; DENSITY MEASUREMENT; PHASE SHIFT
|Radio Systems TEC Level III - D.C. Green|
D.C. Green Radio Systems TEC Level III Pitman Publishing Ltd. 1979 Acrobat 7 Pdf 7.38 Mb. Scanned by artmisa using Canon DR2580C + flatbed option
Keywords: Electronics; Amplitude Modulation; Frequency Modulation; Demodulation; Transmission Lines; Transmitters; RF Power Amplifiers; Receivers; Circuits; Wideband Line Systems
|Laboratory simulation of the surface of Halley's Comet - Jackson, William M|
In the past year we have developed a model for the dissociation of icy grains in comets. In general, this model does not predict the radical yield that is observed in the jets of comets. To reproduce these yields, the concentration of the radical's precursors will have to be too high to be consistent with the abundance that we expect in comets. We have also constructed a theoretical model for the formation of ions on icy cometary grains...
Keywords: FREQUENCY MODULATION; DIFFRACTION; NEODYMIUM LASERS; PHASE MODULATION; SOLID STATE LASERS; YAG LASERS; LASER PUMPING; OPTICAL COMMUNICATION; OSCILLATORS; RING LASERS; SEMICONDUCTOR DIODES; SEMICONDUCTOR LASERS; TRANSMITTERS; AMPLITUDE MODULATION
|Common Lunar Lander (CLL) trajectory analysis - Wagner, Lynn A., Jr.|
Common Lunar Lander trajectory analysis is presented in viewgraph format. Trajectory requirements, trajectory characteristics, trajectory timeline, and alternate trajectory advantages and disadvantages are given.
Keywords: AIR TRANSPORTATION; INTERFEROMETRY; NAVIGATION AIDS; PHASE MODULATION; WEATHER; GLOBAL POSITIONING SYSTEM; INERTIAL NAVIGATION; UNIVERSITY PROGRAM; VISUAL DISCRIMINATION; ALGORITHMS; AMPLITUDE MODULATION; ATTITUDE (INCLINATION); DATA TRANSMISSION
|Wind Tunnel Database Development using Modern Experiment Design and Multivariate Orthogonal Functions - Morelli, Eugene A.|
A wind tunnel experiment for characterizing the aerodynamic and propulsion forces and moments acting on a research model airplane is described. The model airplane called the Free-flying Airplane for Sub-scale Experimental Research (FASER), is a modified off-the-shelf radio-controlled model airplane, with 7 ft wingspan, a tractor propeller driven by an electric motor, and aerobatic capability. FASER was tested in the NASA Langley 12-foot Low-Speed Wind Tunnel, using a combination of traditional s...
Keywords: INTERSYMBOLIC INTERFERENCE; HARMONICS; SIMULATION; MATHEMATICAL MODELS; TIME DEPENDENCE; TRAVELING WAVE TUBES; THREE DIMENSIONAL MODELS; SIGNAL PROCESSING; POWER AMPLIFIERS; QUADRATURE AMPLITUDE MODULATION; BACKWARD WAVES
|Development of a Thin-Film Solar Cell Interconnect for the Powersphere Concept - Simburger, Edward J.|
Dual junction amorphous silicon (a-Si) solar cells produced on polyimide substrate have been selected as the best candidate to produce a lightweight solar array for the PowerSphere program. The PowerSphere concept features a space-inflatable, geodetic solar array approximately 0.6 meters in diameter and capable of generating about 20W of electrical power. Trade studies of various wiring concepts and connection methods led to an interconnect design with a copper contact that wraps around the edge...
Keywords: DISTORTION; SIGNAL DETECTION; TIME DEPENDENCE; SATELLITE COMMUNICATION; SIMULATION; TRAVELING WAVE AMPLIFIERS; PULSE COMMUNICATION; INTERSYMBOLIC INTERFERENCE; NONLINEARITY; QUADRATURE AMPLITUDE MODULATION; REAL TIME OPERATION
|On methods for the determination of the respiratory quotient during rest and work - Christensen, E. H.|
Comparative reliability of human respiratory gas exchange determination methods
Keywords: DATA PROCESSING EQUIPMENT; SIGNAL ANALYSIS; IMP; PULSE FREQUENCY MODULATION TELEMETRY; THRESHOLD DETECTORS (DOSIMETERS); AMPLITUDE MODULATION; ARTIFICIAL SATELLITES; BANDPASS FILTERS; DATA TRANSMISSION; RADIO BURSTS
|Oxidation Behavior of Binary Niobium Alloys - Barrett, Charles A.|
This investigation concludes a study to determine the effects of up to 25 atomic percent of 55 alloying additions on the oxidation characteristics of niobium. The alloys were evaluated by oxidizing in an air atmosphere for 4 hours at 1000 C and 2 hours at 1200 C. Titanium and chromium improved oxidation resistance at both evaluation conditions. Vanadium and aluminum improved oxidation resistance at 1000 C, even though the V scale tended to liquefy and the Al specimens became brittle and the scal...
Keywords: VOICE COMMUNICATION; WAVE PROPAGATION; RESEARCH FACILITIES; MICROWAVES; SINGLE SIDEBAND TRANSMISSION; BALLOON-BORNE INSTRUMENTS; GROUND-AIR-GROUND COMMUNICATION; PHASE MODULATION; AMPLITUDE MODULATION; FREQUENCY MODULATION; NARROWBAND
|Ninth DOD/NASA/FAA Conference on Fibrous Composites in Structural Design, volume 3 - NON|
This publication contains the proceedings of the Ninth DOD/NASA/FAA Conference on Fibrous Composites in Structural Design held at Lake Tahoe, Nevada, during 4-7 Nov. 1991. Presentations were made in the following areas of composite structural design: perspectives in composites, design methodology, design applications, design criteria, supporting technology, damage tolerance, and manufacturing.
Keywords: AMPLITUDE MODULATION; ETCHING; EXPOSURE; PIXELS; POLYMETHYL METHACRYLATE; TRANSPARENCE; COMPUTER AIDED DESIGN; ELECTRON BEAMS; HOLOGRAPHY; IMAGE PROCESSING; IMAGING TECHNIQUES; LITHOGRAPHY; METAL FILMS; PHASE MODULATION
|A video event trigger for high frame rate, high resolution video technology - Williams, Glenn L|
When video replaces film the digitized video data accumulates very rapidly, leading to a difficult and costly data storage problem. One solution exists for cases when the video images represent continuously repetitive 'static scenes' containing negligible activity, occasionally interrupted by short events of interest. Minutes or hours of redundant video frames can be ignored, and not stored, until activity begins...
Keywords: BIT ERROR RATE; AUTOMATIC GAIN CONTROL; BANDWIDTH; CODERS; DATA BASES; DECODERS; ELECTRONIC FILTERS; ENERGY CONSUMPTION; FEASIBILITY ANALYSIS; MODELS; NYQUIST FREQUENCIES; CODING; DECODING; DEMODULATORS; PROVING; QUADRATURE AMPLITUDE MODULATION; SATELLITE COMMUNICATION; SATELLITE INSTRUMENTS; UPLINKING
|Aeroacoustic Codes For Rotor Harmonic and BVI Noise--CAMRAD.Mod1/HIRES - Brooks, Thomas F.|
This paper presents a status of non-CFD aeroacoustic codes at NASA Langley Research Center for the prediction of helicopter harmonic and Blade-Vortex Interaction (BVI) noise. The prediction approach incorporates three primary components: CAMRAD.Mod1 - a substantially modified version of the performance/trim/wake code CAMRAD; HIRES - a high resolution blade loads post-processor; and WOPWOP - an acoustic code...
Keywords: WATER CURRENTS; SCATTER PROPAGATION; LAKES; MEASURING INSTRUMENTS; ADVECTION; RADAR MEASUREMENT; WAVE SCATTERING; WIND EFFECTS; FREQUENCY DISTRIBUTION; SURFACE PROPERTIES; SPECTRAL CORRELATION; GRAVITY WAVES; WAVELENGTHS; AIR WATER INTERACTIONS; REMOTE SENSING; MICROWAVE IMAGERY; CAPILLARY WAVES; BACKSCATTERING; DOPPLER EFFECT; OCEAN SURFACE; WAVE PROPAGATION; PHASE MODULATION; AMPLITUDE MODULATION